Portion of a motorcycle swing arm



FIG. 1 is a side elevational view of a portion of a motorcycle swing armshowing our new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front perspective view thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a top plan view thereof.

The broken line showing of the remainder of the swing arm is forillustrative purposes only and forms no part of the claimed design.

The ornamental design for a portion of a motorcycle swing arm, as shownand described.